极破碎地质条件下的隧洞开挖施工技术

Tunnel Excavation Tech. under Extremely Broken Geological Conditions

摘要:

着重介绍在景洪水电站左岸下游渣场排水洞开挖施工中，对于Ⅴ类围岩洞段，针对不良地质条件下的隧洞开挖施工技术难点，应用超前小管棚预注浆、格栅钢架(或型钢支撑)、顶拱挂网、系统锚杆、喷射混凝土等多种支护措施，安全顺利地进行隧洞锁口和通过洞身段长达574 m的Ⅴ类围岩洞段，其中还包含3条断层破碎带。

Abstract:

The various measures, such as pre-casting through advanced installed pipe shed, grille steel frame or profiled bar support, top arch net, system rockbolt, and injecting concrete, were used to deal with the technical difficulties under bad geological conditions during excavation of tunnel within V type surrounding rocks. The tunnel section of 574 m length was safely excavated through V type surrounding rocks, including 3 broken belts. The fore shaft was successfully made.